Sensor Wet diapers. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electronics in medicine
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Any prolonged stay of the baby in wet diapers can only harm him: diaper rash, other skin damage is almost inevitable. However, not every kid notifies his parents about what happened. So that...
The schematic diagram of the device is shown in the figure. Here E - the sensor itself - two perforated metal electrodes 15x40 mm in size (Fig. 1), separated by several layers of dry gauze and fastened with a rubber ring. The electrodes are connected to the nearby electronic part of the device with a twisted pair or a thin shielded wire.
Fig. 1
The input stage of the device is made on the transistor VT1. The transistor is closed and the voltage on its collector is close to zero if the interelectrode resistance R exceeds the threshold Rpor @ 60 (Up-1), where R is in kiloohms, Up is in volts. Transistor VT1 goes into saturation mode and the voltage on its collector becomes close to + Up at Re < Rthr.
An alarm sound generator is assembled on the DD1 chip. It remains in an unexcited state if the transistor VT1 is closed, and is excited, generating an acoustic alarm signal if VT1 is open.
In what part of the swaddled baby the electrodes should be "mounted" will be decided by the parents. It is only important to ensure that the conductors suitable for them are placed away from him and so that under no circumstances can he get entangled in them. If there is any doubt about this, this connection is made easily broken, for example, with a PEV-2 0,1 wire.
The design of the electrodes can, of course, be different. It is only important that they are safe for the child, have sufficient area (this is found out in a direct experiment) and allow sterilization.
Any galvanic battery with a voltage of 9...6 V can serve as a power source for the device. The current consumed by it in standby mode does not exceed a few microamperes, and in alarm mode it is less than 3 mA.
Publication: cxem.net
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